Abe Lincoln's productivity secret was to use sharper tools to get the job done more efficiently. He said: "If I had six hours to chop down a tree, I'd spend the first four hours sharpening the axe."

Lincoln, who was a skilled woodcutter before becoming one of the most important presidents in US history, probably meant this both literally and figuratively. Inefficient tools waste your energy. It's better to spend the majority of your time finding and cultivating the best tools for any task.